Guessing is expensive. We start with a proper scan session: pull the codes, watch live data — fueling trims, timing, boost, temperatures — and datalog the vehicle doing the exact thing you’re complaining about. Hesitation at part throttle, a stumble when cold, knock counts under load: the data shows where it lives.

That session ends with a straight answer, not a shrug: what’s wrong, whether calibration fixes it, and if it’s hardware — what to tell your installer to replace.

Plenty of drivability complaints are calibration problems wearing a hardware costume:

• Check-engine lights and codes after intake, downpipe, or exhaust installs — the ECU expects hardware that’s gone
• Lean or rich running after fuel-system or airflow changes
• Knock protection pulling timing because the calibration doesn’t match the fuel or parts
• Surging, hunting idle, or harsh shifting after another shop’s tune — cleanup work we see regularly
• Adaptation gone stale after years of sensor drift

In those cases the fix is a correct calibration — and the datalog afterward proves the complaint is gone.

Sometimes the data says hardware: a failing sensor, a boost leak, an injector down, a mechanical problem. We’re a tuning-only shop — we don’t sell you repairs. What you get is the diagnosis in plain language, so the wrench work happens once, at your shop, on the right part.

That split is deliberate. A diagnostician with nothing to sell you but the truth reads data differently.

Another shop tuned it and now it runs worse. Can you fix it?

This is regular work for us. We read what’s in the ECU now, datalog the complaint, and build a correct calibration from scratch — we don’t patch someone else’s file.

Can a tune fix my misfire?

If the misfire is calibration-caused — wrong fueling or timing for the hardware — yes. If it’s mechanical, no, and we’ll tell you that plainly after the scan session instead of selling you a tune that can’t fix it.

The check-engine light came on after my downpipe install. Is something broken?

Usually nothing is broken — the ECU is reporting that hardware it expects is gone. A matching calibration addresses it properly. Codes that point at real faults are a different story — the scan tells us which you have.

Do you do this on diesels and farm equipment too?

Yes — diesel drivability, derates, and ag equipment fault behavior are core work. For farm machines, start with our ag side at agmerica.farm.

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